I scoured the rule book, and didn't find anything against using....these little gems

[Ductard]

These guys

'Cause if I'm going to light up the rear coming out of T4, I want to high-side in style.

As a bonus, they can just tell the medi-vac to follow the trail of purple smoke.




SMOKE BOMB

Overview
Sizes & Specs
Reviews
Looks can be deceiving! The Smoke Bomb produces colored smoke during the burnout process while the appearance of the tire is black! Available in Blue, Purple or Red smoke versions.

Features include:

Aramid belted, DOT approved
Intended for off-road exhibition use by professional riders only. Protect all painted surfaces from possible paint damage.

[carsick]

What, no 160's?? Where's the 650 twin love?

[tsorfas]

Lol just tell me when you planning on using them so I can go stand at T3 with my gopro and Nikon. And the ambulance can wait right there too.

[Ductard]

What, no 160's?? Where's the 650 twin love?

Wait....a 650 twin can light up the rear?

[Ductard]

Wait....a 650 twin can light up the rear?

JK - I bet Rick Doucette could win a race with one of these and still blow a big red burnout cloud on the bank of T6.

Too bad they don't make it in 160 indeed. :-)